/* ================================
   GLOBAL VARIABLES (Colors & Fonts)
=================================== */
:root {
  /* Font stack (fast-loading system fonts) */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Light Mode Colors */
  --color-bg-light: #F5F7FA;
  --color-surface-light: #FFFFFF;
  --color-text-light: #333333;
  --color-text-secondary-light: #777777;

  /* Dark Mode Colors */
  --color-bg-dark: #121212;
  --color-surface-dark: #1E1E1E;
  --color-text-dark: #DDDDDD;
  --color-text-secondary-dark: #AAAAAA;

  /* Accent Colors (shared across modes) */
  --color-primary: #0078D4; /* Tech Blue */
  --color-primary-hover: #006CBE;
  --color-primary-active: #005BA1;
  --color-secondary: #0C7F75; /* Teal-Green secondary accent */

  /* Status / Semantic Colors */
  --color-success: #28A745;
  --color-warning: #FFC107;
  --color-error: #D32F2F;

  /* UI Neutral Colors */
  --color-border-light: #E0E0E0;
  --color-border-dark: #2C2C2C;
}

/* ================================
   BASE STYLES (Default: Dark Mode)
=================================== */
body {
  background-color: var(--color-bg-dark);
  color: var(--color-text-dark);
  font-family: var(--font-sans);
  line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--color-text-dark);
}

/* Links */
a {
  color: var(--color-primary);
  text-decoration: underline;
}
a:hover {
  color: var(--color-primary-hover);
}

/* Buttons */
button.primary {
  background-color: var(--color-primary);
  color: #FFFFFF;
  border: none;
  border-radius: 4px;
  padding: 0.5rem 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease;
}
button.primary:hover {
  background-color: var(--color-primary-hover);
}
button.primary:active {
  background-color: var(--color-primary-active);
}

/* Cards & Modals */
.card {
  background-color: var(--color-surface-dark);
  border: 1px solid var(--color-border-dark);
  border-radius: 6px;
  padding: 1rem;
}


/* ================================
   CUSTOM STYLES
=================================== */

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-dark);
}

::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-hover);
}


/* Focus styles */
input:focus,
textarea:focus,
select:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(0, 120, 212, 0.1);
}

/* Animation for mobile menu */
#mobile-menu {
  transition: all 0.3s ease-in-out;
}

/* Hero section text shadow for better readability */
#home h1 {
  text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.8);
  color: #ffffff !important;
}

#home p {
  text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.8);
  color: #ffffff !important;
}

/* Navigation contrast improvements */
nav {
  background: rgba(0, 0, 0, 0.3) !important;
  backdrop-filter: blur(10px);
}

nav a {
  color: rgba(255, 255, 255, 0.9) !important;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.7);
}

nav a:hover {
  color: #ffffff !important;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.8);
}

nav h1 {
  color: #ffffff !important;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.7);
}

#mobile-menu-button {
  color: #ffffff !important;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.7);
}

#mobile-menu {
  background: rgba(0, 0, 0, 0.9) !important;
  backdrop-filter: blur(10px);
}

#mobile-menu a {
  color: rgba(255, 255, 255, 0.9) !important;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.7);
}

#mobile-menu a:hover {
  color: #ffffff !important;
}

/* Hover effects for cards */
.card:hover {
  transform: translateY(-2px);
  transition: transform 0.3s ease;
}

/* Button hover effects */
button {
  transition: all 0.3s ease;
}

/* Form input styles */
input, textarea, select {
  transition: all 0.3s ease;
}


/* Icon transitions */
svg {
  transition: all 0.3s ease;
}

/* Responsive typography */
@media (max-width: 640px) {
  #home h1 {
    font-size: 3rem;
  }
  
  #home p {
    font-size: 1.125rem;
  }
}

/* Loading animation for images */
img {
  transition: opacity 0.3s ease;
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-border-light: #000000;
    --color-border-dark: #FFFFFF;
  }
}